destroy instantiated particle

Questions & Answers
1

this script instantiates a liquid

if(theCollision.gameObject.name == “book”)
{
Instantiate(liquid, paper.transform.position, transform.rotation);
}

how to make the instantiated liquid to be a child of the gameobject then destroy it oncollision exit

2 
if(theCollision.gameObject.name == "book") { 
GameObject childLiquid=Instantiate(liquid, paper.transform.position, transform.rotation);
// I assume your parent object is named "Par"
childLiquid.transform.parent = Par.tranform;

}